Preparing coke for charging blast-furnaces.



7 ing it into a blast furnace, and

in the i ractice of mv invention. 1

entrain si a rats rarnn'r r MARCUS CASSIDY STEESH OE EYGUNGSTOVIN, OHIO, ASSIGNGE OF ONE-HALF T0 ROLLER C. STEESE, 0F YUUNG-STOVJN, OHIG.

PREPARING COKE FOB. CHARGING BLAST-FURNACES.

on incl.

Ho Brewing.

To (ZZZ "whom it may concern. 7

Be it known that 1, Marcus Cessna; STEEs-n, residing at Youngstown, in the county of Mahoning and State of Ohio, a citizen of the United States, have invented or discovered certain new and useful improvements in Preparing Coke for Qharg ing Blast-Furnaces, of which improvements the following is a specification.

My invention relates to improvements in the operation of preparing coke for chargthe objectis to increase the productiveness of the furnace, that is, to reduce materially the coke consumption per ton of product and to get a larger yield from a given quantity of COlQQ. gain a further advantage in having the furnace ran more smoothly than in the present day practice.

In the practice of the present day, the furnace charge, introduced at the top and occupying a substantial portion of the furnace chamber, settles gradually downward through the furnace chamber the smelting operation progresses at the bottom, and the superposed portions of the char e come gradually to the fusion zone. in this practice there is very considerable consumption of the coke content of the charge in the upper zones of the furnace, and before" the fusion zone is reached; due to the reacting gases which, while the furnace is in operation, are constantly ascending, through the charge, to the top of the furnace. Such premature coke consumption is objectionable, both because the coke consumed is waste, and a correspondingly greater quantity must be used in charging the furnace; and because the effects are increase in temperature in the upper zones of the furnace, and fusion of the charge at a point higher above the bottom oft-he furnace than would otherwise be the case, from which conditions follow slips, poorer economies and, other irregularities in operation- My invention consists in coverin the lumps or particles of coke with a coating-of material, which coating will protect the coke entirely or to a substantial degree from the consuming action of the gases to which it is otherwise exposed in its descent through the,

furnace, and consequently all of the coke or a substantially greater portion of it Wlll be brought to the fusion zone of the furnace iepeoification of Letters Patent.

tation or stirring,

Patented Feb. 25, 1913..

Application filed February 2%., 1911. Serial N0. 610,653.

where it becomes useful in the smelting operation, and in corresponding degree the objections hereinbefore noted will be overcome.

I preferably apply the coating material in the form of a sludge made by adding Water to the material in pulverulent or finely divided condition. The material which I employ for this purpose is a slurry of iron ore; and, in this connection, it may be noted that the Misabi ore, and finer old range ores now extensively used, because of their flocculent nature, lend themselves peculiarly well to this treatment. Furthermore, there is additional gain in so applying fiocculent ore; it will not, when introduced into the furnace in wet or caked condition, rise so freely nor be carried off to so great an extent witlr, the flow of gases through the downcomer, as it would, were it charged into the furnace dry and in the condition in whioh it is ordinarily used.

it is not essential to my invention, at what point in the preparation and charging of the coke I make application of the protective coating; it may be done before the coke is placed in the ship, or when in the skip, or after it is delivered from the skip into the mouth of the furnace. In case the coating is applied in the form of a sludge or slurry, the coating material and the coke to be coated may be tumbled together in a concretemixing machine before being placed in the skip, or the coating may be effected with sufficient completeness by throwing the ma terials together either in a receptacle prepared for that purpose at the foot of the furnace or in the skip, or in the furnace bellor even in the furnace itself; and such a throwing together may be supplemented, so far as conditions permit, by further agimanual or otherwise, as may be desired. The coke may be prepared when it is withdrawn from the ovens, by spraying with such a sludge or slurry as I have described.

The protective coating may, it will be understood, be' of most tenuous thickness, and still be effective; and, though each individuallump or particle of coke may not be completely incased, to the extent that the coke is protected by the coating from wasteful consumption, my invention will be practised.

The coated coke will preferably beintroduced into the furnace while the coating is newly formed and wet but this isnot a. nec- 110 esszn'y condition. 'i'he ccai'ed lumps and ing coke for charging into a blast furnace. narticlee of" coke may be dried before using, which consists in covering ihe huncs 01* parif for any reason such drying may become ticles of coke with a coating of ifbki. ore. desirable. In testimony whereof I have hereunto set if claim herein as my invention: my hand 1. The method herein described of re are e v1 v v 1 i 1 ing coke for charging into a blast f iirn zice, MARLL: SJIIDESIL" which consists in covering the lumps or Witnesses: particles of coke with a slurry of iron ore. 1 A. Axnmgws, 10 2. The method herein described of prvpm G. F. Rose. 

